Demonstrates the use a 16x2 LCD display. The LiquidCrystal library works with all LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface.

This sketch prints "Hello World!" to the LCD and shows the time.

The circuit: * LCD RS pin to digital pin 12 // change this to any digital pin you have left with no connection ; i used pin 8 * LCD Enable pin to digital pin 11 // change this to any digital pin you have left with no connection ; i used pin 7 * LCD D4 pin to digital pin 5 * LCD D5 pin to digital pin 4 // change this to any digital pin you have left with no connection ; i used pin 6 * LCD D6 pin to digital pin 3 * LCD D7 pin to digital pin 2 * LCD R/W pin to ground * 10K resistor: * ends to +5V and ground * wiper to LCD VO pin (pin 3)

void setup() { // set up the LCD's number of columns and rows: lcd.begin(16, 2); // Print a message to the LCD. lcd.print("hello, world!");}

void loop() { // set the cursor to column 0, line 1 // (note: line 1 is the second row, since counting begins with 0): lcd.setCursor(0, 1); // print the number of seconds since reset: lcd.print(millis()/1000);}